MRKNYSE · Pharmaceutical Preparations

Merck & Co., Inc.

Alert me on MRK

Insider buys, 6 months

Congress trades, 6 months

Signals, 6 months

Six months

After each filing

Oct 7 Sale Rep. Maria Elvira Salazar House

1 week

+2.0%S&P −0.3%

1 month

Result in10 trading days

3 months

Result in52 trading days

6 months

Result in115 trading days

Sep 9 Buy Rep. Maria Elvira Salazar House

1 week

+2.3%S&P +0.6%

1 month

+1.2%S&P +3.0%

3 months

Result in32 trading days

6 months

Result in95 trading days

Aug 14 Sale Zachary Jennifer Insider

1 week

+12.3%S&P −1.4%

1 month

+6.5%S&P −2.4%

3 months

Result in14 trading days

6 months

Result in77 trading days

Aug 14 Sale Guindo Chirfi Insider

1 week

+12.3%S&P −1.4%

1 month

+6.5%S&P −2.4%

3 months

Result in14 trading days

6 months

Result in77 trading days

Aug 13 Sale DeLuca Richard R. Insider

1 week

+9.9%S&P −2.0%

1 month

+6.9%S&P −2.2%

3 months

Result in13 trading days

6 months

Result in76 trading days

Show all 61

Aug 11 Sale DeLuca Richard R. Insider

1 week

+3.6%S&P −0.4%

1 month

+11.0%S&P −1.7%

3 months

Result in11 trading days

6 months

Result in74 trading days

Aug 8 Sale Guindo Chirfi Insider

1 week

+3.9%S&P 0.0%

1 month

+12.7%S&P −1.4%

3 months

Result in10 trading days

6 months

Result in73 trading days

Aug 8 Sale Maraldo David R. Insider

1 week

+3.9%S&P 0.0%

1 month

+12.7%S&P −1.4%

3 months

Result in10 trading days

6 months

Result in73 trading days

Aug 8 Sale Williams David Michael Insider

1 week

+3.9%S&P 0.0%

1 month

+12.7%S&P −1.4%

3 months

Result in10 trading days

6 months

Result in73 trading days

Jul 21 Sale Sen. Alan Armstrong Senate

1 week

+2.3%S&P −2.4%

1 month

+16.9%S&P +2.0%

3 months

+17.0%S&P +3.2%

6 months

Result in60 trading days

Mar 16 Buy Rep. Josh Gottheimer House

1 week

+0.4%S&P −2.4%

1 month

−0.4%S&P +4.9%

3 months

+0.1%S&P +12.2%

6 months

+26.7%S&P +13.0%

Feb 13 Sale Guindo Chirfi Insider

1 week

+2.0%S&P +0.1%

1 month

−3.9%S&P −1.6%

3 months

−7.6%S&P +8.7%

6 months

+13.7%S&P +13.9%

Feb 11 Sale Li Dean Y Insider

1 week

+2.1%S&P −1.1%

1 month

−3.1%S&P −4.3%

3 months

−4.2%S&P +7.6%

6 months

+15.3%S&P +13.0%

Feb 10 Sale Guindo Chirfi Insider

1 week

+3.8%S&P −0.8%

1 month

−1.1%S&P −3.8%

3 months

−3.4%S&P +7.0%

6 months

+15.1%S&P +12.2%

Feb 10 Sale Zachary Jennifer Insider

1 week

+3.8%S&P −0.8%

1 month

−1.1%S&P −3.8%

3 months

−3.4%S&P +7.0%

6 months

+15.1%S&P +12.2%

Feb 7 Sale Oosthuizen Johannes Jacobus Insider

1 week

+3.3%S&P −1.6%

1 month

−1.2%S&P −2.5%

3 months

−4.7%S&P +6.8%

6 months

+12.5%S&P +11.6%

Feb 7 Sale Litchfield Caroline Insider

1 week

+3.3%S&P −1.6%

1 month

−1.2%S&P −2.5%

3 months

−4.7%S&P +6.8%

6 months

+12.5%S&P +11.6%

Feb 7 Sale Williams David Michael Insider

1 week

+3.3%S&P −1.6%

1 month

−1.2%S&P −2.5%

3 months

−4.7%S&P +6.8%

6 months

+12.5%S&P +11.6%

Feb 7 Sale Smart Dalton E. III Insider

1 week

+3.3%S&P −1.6%

1 month

−1.2%S&P −2.5%

3 months

−4.7%S&P +6.8%

6 months

+12.5%S&P +11.6%

Feb 7 Sale Guindo Chirfi Insider

1 week

+3.3%S&P −1.6%

1 month

−1.2%S&P −2.5%

3 months

−4.7%S&P +6.8%

6 months

+12.5%S&P +11.6%

Feb 7 Sale Li Dean Y Insider

1 week

+3.3%S&P −1.6%

1 month

−1.2%S&P −2.5%

3 months

−4.7%S&P +6.8%

6 months

+12.5%S&P +11.6%

Feb 7 Sale Davis Robert M Insider

1 week

+3.3%S&P −1.6%

1 month

−1.2%S&P −2.5%

3 months

−4.7%S&P +6.8%

6 months

+12.5%S&P +11.6%

Feb 7 Sale DeLuca Richard R. Insider

1 week

+3.3%S&P −1.6%

1 month

−1.2%S&P −2.5%

3 months

−4.7%S&P +6.8%

6 months

+12.5%S&P +11.6%

Jan 15 Sale Rep. Julie Johnson House

1 week

−1.3%S&P +0.2%

1 month

+11.8%S&P −0.8%

3 months

+8.4%S&P +2.8%

6 months

+17.7%S&P +8.8%

Jan 12 Buy Rep. Gilbert Cisneros House

1 week

+2.6%S&P −1.2%

1 month

+10.1%S&P −1.8%

3 months

+9.7%S&P +1.2%

6 months

+19.6%S&P +8.8%

Dec 15, 2025 Buy Rep. Gilbert Cisneros House

1 week

+6.9%S&P +1.6%

1 month

+10.7%S&P +2.2%

3 months

+17.1%S&P −2.5%

6 months

+17.6%S&P +10.9%

Dec 11, 2025 Sale Rep. Julie Johnson House

1 week

+1.6%S&P +0.1%

1 month

+11.6%S&P +1.6%

3 months

+17.4%S&P −1.3%

6 months

+17.5%S&P +10.7%

Nov 13, 2025 Sale Downing Cristal N Insider

1 week

+2.2%S&P −2.9%

1 month

+8.8%S&P +1.3%

3 months

+31.9%S&P +1.9%

6 months

+23.0%S&P +10.5%

Nov 5, 2025 Sale Williams David Michael Insider

1 week

+8.4%S&P +0.9%

1 month

+18.2%S&P +1.2%

3 months

+45.7%S&P +2.2%

6 months

+34.1%S&P +9.5%

Oct 10, 2025 Sale Rep. Valerie Hoyle House

1 week

+0.7%S&P +1.2%

1 month

+6.1%S&P +3.0%

3 months

+27.4%S&P +4.9%

6 months

+39.8%S&P +6.2%

Oct 5, 2025 Sale Rep. Sheri Biggs House

1 week

−3.5%S&P −1.3%

1 month

−5.6%S&P +0.5%

3 months

+23.6%S&P +3.3%

6 months

+40.9%S&P +1.2%

Sep 12, 2025 Buy Rep. Gilbert Cisneros House

1 week

−0.8%S&P +1.2%

1 month

+4.5%S&P +0.5%

3 months

+23.8%S&P +3.4%

6 months

+45.3%S&P +2.1%

Sep 12, 2025 Buy Rep. Valerie Hoyle House

1 week

−0.8%S&P +1.2%

1 month

+4.5%S&P +0.5%

3 months

+23.8%S&P +3.4%

6 months

+45.3%S&P +2.1%

Sep 12, 2025 Sale Rep. Lisa McClain House

1 week

−0.8%S&P +1.2%

1 month

+4.5%S&P +0.5%

3 months

+23.8%S&P +3.4%

6 months

+45.3%S&P +2.1%

Sep 11, 2025 Sale Rep. Julie Johnson House

1 week

−0.6%S&P +1.2%

1 month

+4.5%S&P +1.1%

3 months

+20.8%S&P +5.1%

6 months

+43.0%S&P +2.3%

Aug 29, 2025 Buy Rep. Marjorie Taylor Greene House

1 week

−1.0%S&P +1.6%

1 month

+6.5%S&P +4.7%

3 months

+20.3%S&P +6.5%

6 months

+43.3%S&P +7.6%

Aug 20, 2025 Buy Rep. Ritchie John Torres House

1 week

−3.3%S&P +2.1%

1 month

−5.7%S&P +5.2%

3 months

+11.5%S&P +4.5%

6 months

+46.5%S&P +8.0%

Aug 20, 2025 Sale Rep. Ritchie John Torres House

1 week

−3.3%S&P +2.1%

1 month

−5.7%S&P +5.2%

3 months

+11.5%S&P +4.5%

6 months

+46.5%S&P +8.0%

Aug 13, 2025 Buy Rep. Lisa McClain House

1 week

+4.0%S&P −1.5%

1 month

−1.1%S&P +2.5%

3 months

+11.6%S&P +6.3%

6 months

+49.4%S&P +6.3%

Jul 14, 2025 Buy Rep. Julie Johnson House

1 week

+0.1%S&P +1.1%

1 month

+1.5%S&P +3.7%

3 months

+6.2%S&P +6.9%

6 months

+35.3%S&P +12.1%

Jul 14, 2025 Sale Rep. Scott Scott Franklin House

1 week

+0.1%S&P +1.1%

1 month

+1.5%S&P +3.7%

3 months

+6.2%S&P +6.9%

6 months

+35.3%S&P +12.1%

Jul 3, 2025 Buy Rep. Scott Scott Franklin House

1 week

+3.4%S&P +0.7%

1 month

−0.1%S&P +1.2%

3 months

+11.3%S&P +8.1%

6 months

+35.3%S&P +11.4%

Jun 6, 2025 Sale Rep. Gilbert Cisneros House

1 week

+3.1%S&P +0.5%

1 month

+7.0%S&P +4.7%

3 months

+7.7%S&P +8.8%

6 months

+27.2%S&P +14.7%

May 31, 2025 Sale Rep. Rob Bresnahan House

1 week

+4.0%S&P +1.2%

1 month

+9.1%S&P +5.0%

3 months

+13.2%S&P +8.3%

6 months

+36.2%S&P +15.4%

May 12, 2025 Sale Rep. Bruce Westerman House

1 week

+1.7%S&P +1.0%

1 month

+6.8%S&P +2.9%

3 months

+9.0%S&P +10.2%

6 months

+21.1%S&P +17.1%

May 8, 2025 Buy Rep. Rob Bresnahan House

1 week

+0.1%S&P +5.3%

1 month

+7.1%S&P +6.9%

3 months

+6.4%S&P +13.0%

6 months

+15.9%S&P +19.6%

May 8, 2025 Sale Rep. Jefferson Shreve House

1 week

+0.1%S&P +5.3%

1 month

+7.1%S&P +6.9%

3 months

+6.4%S&P +13.0%

6 months

+15.9%S&P +19.6%

May 6, 2025 Buy Rep. Gilbert Cisneros House

1 week

−7.1%S&P +4.7%

1 month

−0.2%S&P +6.8%

3 months

+2.6%S&P +13.0%

6 months

+8.8%S&P +21.4%

May 6, 2025 Buy Rep. Marjorie Taylor Greene House

1 week

−7.1%S&P +4.7%

1 month

−0.2%S&P +6.8%

3 months

+2.6%S&P +13.0%

6 months

+8.8%S&P +21.4%

Apr 16, 2025 Buy Rep. Bruce Westerman House

1 week

+6.1%S&P +4.6%

1 month

−1.0%S&P +13.0%

3 months

+2.7%S&P +19.8%

6 months

+10.9%S&P +26.9%

Apr 11, 2025 Buy Rep. Marjorie Taylor Greene House

1 week

−0.3%S&P −2.2%

1 month

−7.2%S&P +9.0%

3 months

+5.2%S&P +16.1%

6 months

+9.1%S&P +23.5%

Apr 11, 2025 Sale Rep. Kelly Louise Morrison House

1 week

−0.3%S&P −2.2%

1 month

−7.2%S&P +9.0%

3 months

+5.2%S&P +16.1%

6 months

+9.1%S&P +23.5%

Apr 7, 2025 Sale Rep. Gilbert Cisneros House

1 week

−0.7%S&P +8.3%

1 month

−1.6%S&P +13.8%

3 months

+7.5%S&P +26.4%

6 months

+11.6%S&P +36.4%

Mar 27, 2025 Sale Rep. Rob Bresnahan House

1 week

−8.7%S&P −9.1%

1 month

−5.1%S&P −0.2%

3 months

−10.4%S&P +11.5%

6 months

−10.2%S&P +20.1%

Mar 9, 2025 Buy Rep. Jefferson Shreve House

1 week

+0.4%S&P +1.2%

1 month

−16.4%S&P −11.2%

3 months

−16.0%S&P +7.3%

6 months

−9.5%S&P +16.7%

Mar 6, 2025 Buy Rep. Gilbert Cisneros House

1 week

−0.1%S&P −2.3%

1 month

−13.5%S&P −12.2%

3 months

−15.9%S&P +4.3%

6 months

−9.5%S&P +13.3%

Feb 12, 2025 Buy Rep. Julie Johnson House

1 week

+6.0%S&P −1.6%

1 month

+13.2%S&P −7.0%

3 months

−10.6%S&P −2.9%

6 months

+1.6%S&P +6.2%

Feb 11, 2025 Sale Rep. Gilbert Cisneros House

1 week

+2.3%S&P +1.2%

1 month

+10.4%S&P −6.7%

3 months

−13.5%S&P −2.3%

6 months

−1.6%S&P +7.5%

Feb 10, 2025 Sale Rep. Byron Donalds House

1 week

−1.1%S&P +1.3%

1 month

+9.4%S&P −8.9%

3 months

−10.7%S&P −2.8%

6 months

−2.6%S&P +7.2%

Feb 10, 2025 Sale Rep. Jared Moskowitz House

1 week

−1.1%S&P +1.3%

1 month

+9.4%S&P −8.9%

3 months

−10.7%S&P −2.8%

6 months

−2.6%S&P +7.2%

Feb 10, 2025 Sale Rep. Josh Gottheimer House

1 week

−1.1%S&P +1.3%

1 month

+9.4%S&P −8.9%

3 months

−10.7%S&P −2.8%

6 months

−2.6%S&P +7.2%

Every purchase and sale on this ticker reported by a member of Congress or an insider, measured from the close of the first trading day after it became public to the close 1 week, 1 month, 3 months and 6 months later, each beside the S&P over the same days.

Filings for MRK

148 held · newest 5148 held · newest 2

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See all 148 filings for MRK

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Government contracts, last 12 months

Awards of $10M and up, from USAspending · context, not a signal

No contracts of $10M or more in the last 12 months.

Lobbying

Last four quarters

$1.9MQ4 2025

$4.2MQ1 2026

$2.3MQ2 2026

$2.4MQ3 2026

Up 5 percent from Q2 2026. Reported by the company to the Senate each quarter.Original report ↗

Read from LDA.gov between Sep 23, 2026 and Oct 21, 2026. Senate Office of Public Records cannot vouch for the data or analyses derived from these data after the data have been retrieved from LDA.gov.